:root{
  --bg:#f4f6fb;--panel:#ffffff;--ink:#1c2333;--muted:#66708a;--line:#e3e7f0;
  --brand:#2f5bea;--brand-2:#1f45c9;--brand-soft:#e8eeff;--ok:#1a9a5a;--ok-soft:#e4f6ec;
  --warn:#d98a06;--warn-soft:#fff4dd;--bad:#d64545;--bad-soft:#ffe9e9;--rec:#e0353b;
  --radius:14px;--shadow:0 6px 24px rgba(28,35,51,.07);
  --side:270px;--drawer:420px;
}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC","Segoe UI",system-ui,-apple-system,sans-serif;
  background:var(--bg);color:var(--ink);font-size:15px;line-height:1.55;overflow:hidden}
button{font-family:inherit;font-size:inherit;cursor:pointer;border:none;background:none;color:inherit}
button:disabled{cursor:not-allowed;opacity:.55}
textarea,input,select{font-family:inherit;font-size:inherit;color:inherit}
a{color:var(--brand)}
.en{font-family:Georgia,"Times New Roman","Noto Serif",serif;font-size:1.08em;line-height:1.6}
.hidden{display:none!important}
kbd{background:#eef1f7;border:1px solid #d5dbe8;border-bottom-width:2px;border-radius:5px;padding:0 6px;font-size:.85em;font-family:inherit}

/* ---------- layout ---------- */
#app{display:grid;grid-template-columns:var(--side) 1fr auto;height:100vh;width:100vw}
.sidebar{background:var(--panel);border-right:1px solid var(--line);display:flex;flex-direction:column;overflow:hidden}
.main{display:flex;flex-direction:column;min-width:0;overflow:hidden}
.drawer{width:0;overflow:hidden;background:var(--panel);border-left:1px solid var(--line);transition:width .25s ease;display:flex;flex-direction:column}
.drawer.open{width:var(--drawer)}
@media (max-width:1180px){ .drawer.open{width:380px} :root{--side:240px} }
@media (max-width:980px){
  #app{grid-template-columns:1fr}
  .sidebar{position:fixed;left:0;top:0;bottom:0;width:280px;z-index:40;transform:translateX(-100%);transition:transform .2s}
  .sidebar.show{transform:none;box-shadow:0 0 40px rgba(0,0,0,.25)}
  .drawer{position:fixed;right:0;top:0;bottom:0;z-index:40;box-shadow:0 0 40px rgba(0,0,0,.2)}
  .drawer.open{width:min(92vw,440px)}
  .topbar .menu-btn{display:inline-flex}
}
.menu-btn{display:none}

/* ---------- sidebar ---------- */
.brand{padding:18px 18px 10px;display:flex;align-items:center;gap:10px}
.brand .logo{width:38px;height:38px;border-radius:11px;background:linear-gradient(135deg,var(--brand),#7c4dff);display:grid;place-items:center;color:#fff;font-weight:700;font-size:15px}
.brand h1{font-size:17px;margin:0;line-height:1.1}
.brand small{color:var(--muted);font-size:12px}
.side-scroll{flex:1;overflow:auto;padding:0 12px 12px}
.side-section{margin-top:14px}
.side-section h3{font-size:12px;color:var(--muted);letter-spacing:.06em;margin:0 6px 8px;font-weight:600}
.tier-list{display:flex;flex-direction:column;gap:6px}
.tier-btn{display:flex;flex-direction:column;align-items:flex-start;padding:9px 12px;border-radius:10px;border:1.5px solid var(--line);background:#fff;text-align:left;transition:.15s}
.tier-btn:hover{border-color:#b9c6ee;background:#f7f9ff}
.tier-btn.active{border-color:var(--brand);background:var(--brand-soft)}
.tier-btn b{font-size:14px}
.tier-btn span{font-size:12px;color:var(--muted)}
.mode-list{display:flex;flex-direction:column;gap:3px}
.mode-btn{display:flex;align-items:center;gap:10px;padding:8px 10px;border-radius:9px;text-align:left;width:100%}
.mode-btn:hover{background:#f2f5fc}
.mode-btn.active{background:var(--brand-soft);color:var(--brand-2);font-weight:600}
.mode-btn .ico{width:26px;text-align:center;font-size:16px}
.mode-btn small{display:block;color:var(--muted);font-weight:400;font-size:12px}
.history-list{display:flex;flex-direction:column;gap:4px}
.hist-item{display:flex;align-items:center;gap:8px;padding:7px 9px;border-radius:9px;font-size:13px;width:100%;text-align:left}
.hist-item:hover{background:#f2f5fc}
.hist-item .band{min-width:38px;text-align:center;font-weight:700;border-radius:7px;padding:2px 4px;background:var(--brand-soft);color:var(--brand-2);font-size:12px}
.hist-item .t{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.hist-item .d{color:var(--muted);font-size:11px}
.hist-item .del{opacity:0;color:var(--muted);padding:2px 5px;border-radius:6px}
.hist-item:hover .del{opacity:1}
.hist-item .del:hover{background:var(--bad-soft);color:var(--bad)}
.side-foot{padding:12px;border-top:1px solid var(--line);display:flex;gap:8px}
.side-foot button{flex:1;padding:9px;border-radius:10px;background:#f2f5fc;font-weight:600}
.side-foot button:hover{background:#e6ebfa}

/* ---------- topbar & status ---------- */
.topbar{display:flex;align-items:center;gap:10px;padding:10px 18px;background:var(--panel);border-bottom:1px solid var(--line);min-height:56px}
.topbar .title{font-weight:700;font-size:16px;flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.pills{display:flex;gap:6px;flex-wrap:wrap}
.pill{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border-radius:999px;background:#f2f5fc;font-size:12px;color:var(--muted);cursor:help;white-space:nowrap}
.pill .dot{width:8px;height:8px;border-radius:50%;background:#bbb}
.pill.ok .dot{background:var(--ok)} .pill.warn .dot{background:var(--warn)} .pill.bad .dot{background:var(--bad)}
.icon-btn{padding:6px 10px;border-radius:9px;background:#f2f5fc;font-weight:600;font-size:13px;display:inline-flex;align-items:center;gap:6px}
.icon-btn:hover{background:#e6ebfa}

/* ---------- content ---------- */
.content{flex:1;overflow:auto;padding:18px 22px 30px}
.view{max-width:980px;margin:0 auto;display:flex;flex-direction:column;gap:16px}
.card{background:var(--panel);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px 20px}
.card h2{margin:0 0 8px;font-size:17px}
.card .sub{color:var(--muted);font-size:13px;margin:0 0 12px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 18px;border-radius:11px;font-weight:600;background:#eef1f7;transition:.15s;white-space:nowrap}
.btn:hover{background:#e3e8f3}
.btn.primary{background:var(--brand);color:#fff}.btn.primary:hover{background:var(--brand-2)}
.btn.ghost{background:transparent;border:1.5px solid var(--line)}.btn.ghost:hover{background:#f4f6fb}
.btn.danger{background:var(--bad-soft);color:var(--bad)}.btn.danger:hover{background:#ffd9d9}
.btn.big{padding:14px 26px;font-size:16px;border-radius:14px}
.btn.sm{padding:6px 12px;font-size:13px;border-radius:9px}
.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.row.between{justify-content:space-between}
.grow{flex:1}
.muted{color:var(--muted)}
.small{font-size:13px}
.tag{display:inline-block;padding:2px 9px;border-radius:999px;font-size:12px;background:#eef1f7;color:var(--muted);font-weight:600}
.tag.brand{background:var(--brand-soft);color:var(--brand-2)}.tag.ok{background:var(--ok-soft);color:var(--ok)}
.tag.warn{background:var(--warn-soft);color:var(--warn)}.tag.bad{background:var(--bad-soft);color:var(--bad)}

/* home */
.hero{background:linear-gradient(135deg,#2f5bea 0%,#6a3df5 100%);color:#fff;border-radius:18px;padding:28px 30px;box-shadow:var(--shadow)}
.hero h2{margin:0 0 6px;font-size:24px}
.hero p{margin:0;opacity:.92}
.home-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:16px}
.start-card{display:flex;flex-direction:column;gap:10px}
.start-card .big-ico{font-size:34px}
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px}
.step{background:#f7f9ff;border-radius:12px;padding:12px 14px;font-size:13px}
.step b{display:block;margin-bottom:4px;color:var(--brand-2)}
.status-list{display:flex;flex-direction:column;gap:8px;font-size:13px}
.status-list .item{display:flex;gap:10px;align-items:flex-start}
.status-list .dot{width:10px;height:10px;border-radius:50%;margin-top:6px;flex:none;background:#bbb}
.dot.ok{background:var(--ok)}.dot.warn{background:var(--warn)}.dot.bad{background:var(--bad)}

/* stepper */
.stepper{display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.stepper .st{display:flex;align-items:center;gap:7px;padding:6px 12px;border-radius:999px;background:#eef1f7;font-size:13px;color:var(--muted);font-weight:600}
.stepper .st.done{background:var(--ok-soft);color:var(--ok)}
.stepper .st.cur{background:var(--brand);color:#fff}
.stepper .arrow{color:#c3c9d8}

/* examiner */
.examiner{display:flex;gap:14px}
.avatar{width:52px;height:52px;border-radius:50%;background:linear-gradient(135deg,#ffb35c,#ff7a59);display:grid;place-items:center;font-size:26px;flex:none;position:relative}
.avatar.speaking::after{content:"";position:absolute;inset:-4px;border-radius:50%;border:3px solid #ff9f5c;animation:pulse 1.2s infinite}
@keyframes pulse{0%{transform:scale(1);opacity:1}100%{transform:scale(1.25);opacity:0}}
.bubble{flex:1;min-width:0}
.bubble .who{font-size:12px;color:var(--muted);margin-bottom:3px;display:flex;gap:8px;align-items:center}
.bubble .text{background:#f7f9ff;border-radius:4px 14px 14px 14px;padding:12px 14px}
.status-line{margin-top:10px;display:flex;align-items:center;gap:8px;font-size:14px;color:var(--brand-2);font-weight:600;min-height:24px}
.status-line.rec{color:var(--rec)} .status-line.busy{color:var(--warn)}
.spinner{width:16px;height:16px;border:2.5px solid #d8def0;border-top-color:var(--brand);border-radius:50%;animation:spin .8s linear infinite;display:inline-block}
@keyframes spin{to{transform:rotate(360deg)}}

/* cue card */
.cue{border:2px dashed #b9c6ee;border-radius:14px;padding:16px 18px;background:#fbfcff}
.cue .t{font-weight:700;font-size:17px;margin-bottom:8px}
.cue ul{margin:0 0 0 18px;padding:0}
.cue .you-should{color:var(--muted);font-size:13px;margin-bottom:6px}
.notes{width:100%;min-height:80px;border:1.5px solid var(--line);border-radius:10px;padding:10px;resize:vertical;margin-top:10px;background:#fff}

/* timer & visualizer */
.timer{font-variant-numeric:tabular-nums;font-weight:700;font-size:28px;letter-spacing:.02em}
.timer.warn{color:var(--warn)} .timer.bad{color:var(--bad)}
.timer-box{display:flex;flex-direction:column;align-items:center;padding:12px 18px;background:#f7f9ff;border-radius:12px;min-width:140px}
.timer-box .lbl{font-size:12px;color:var(--muted)}
.viz{width:100%;height:64px;border-radius:12px;background:#f7f9ff;display:block}

/* transcript */
.chat{display:flex;flex-direction:column;gap:10px;max-height:320px;overflow:auto;padding-right:4px}
.msg{display:flex;gap:10px;align-items:flex-start}
.msg .b{padding:9px 13px;border-radius:12px;max-width:85%}
.msg.ex .b{background:#f4f6fb;border-top-left-radius:4px}
.msg.me{flex-direction:row-reverse}
.msg.me .b{background:var(--brand-soft);border-top-right-radius:4px}
.msg .meta{font-size:11px;color:var(--muted);margin-top:4px}
.msg .edit{font-size:12px;color:var(--brand);margin-left:8px}

/* push to talk */
.ptt-wrap{display:flex;flex-direction:column;align-items:center;gap:10px;padding:10px 0}
.ptt{width:112px;height:112px;border-radius:50%;background:var(--brand);color:#fff;font-size:40px;box-shadow:0 10px 30px rgba(47,91,234,.35);transition:.15s;display:grid;place-items:center;position:relative}
.ptt:hover{transform:scale(1.04)}
.ptt.rec{background:var(--rec);box-shadow:0 10px 30px rgba(224,53,59,.4)}
.ptt.rec::before{content:"";position:absolute;inset:-8px;border-radius:50%;border:3px solid rgba(224,53,59,.6);animation:pulse 1.1s infinite}
.ptt.ready{animation:bounce 1.4s infinite}
@keyframes bounce{0%,100%{box-shadow:0 10px 30px rgba(47,91,234,.35)}50%{box-shadow:0 10px 40px rgba(47,91,234,.7)}}
.ptt-hint{font-weight:600;font-size:15px}
.ptt-sub{color:var(--muted);font-size:13px;text-align:center}
.answer-text{width:100%;min-height:110px;border:1.5px solid var(--line);border-radius:12px;padding:12px;resize:vertical}
.answer-text:focus{outline:2px solid #b9c6ee}

/* writing */
.chips{display:flex;gap:8px;flex-wrap:wrap}
.chip{padding:7px 14px;border-radius:999px;background:#eef1f7;font-weight:600;font-size:13px}
.chip.active{background:var(--brand);color:#fff}
.prompt-box{background:#fbfcff;border:1.5px solid var(--line);border-radius:12px;padding:16px 18px;white-space:pre-wrap}
.chart-wrap{margin-top:12px;overflow-x:auto}
.chart-wrap svg{max-width:100%;height:auto;display:block;margin:0 auto}
.chart-title{text-align:center;font-weight:700;margin:8px 0 4px}
table.data{border-collapse:collapse;margin:8px auto;font-size:14px}
table.data th,table.data td{border:1px solid #d5dbe8;padding:6px 12px;text-align:center}
table.data th{background:#eef1f7}
.process{display:flex;flex-wrap:wrap;gap:8px;align-items:center;justify-content:center;margin-top:10px}
.process .pstep{background:#fff;border:1.5px solid #b9c6ee;border-radius:10px;padding:8px 12px;max-width:180px;font-size:13px;text-align:center}
.process .parrow{color:#8b9bd6;font-size:20px}
.editor{width:100%;min-height:380px;border:1.5px solid var(--line);border-radius:12px;padding:16px;resize:vertical;line-height:1.7;font-size:16px;font-family:Georgia,"Times New Roman",serif;background:#fff}
.editor:focus{outline:2px solid #b9c6ee}
.wc{font-weight:700}.wc.ok{color:var(--ok)}.wc.low{color:var(--warn)}
.progressbar{height:8px;background:#eef1f7;border-radius:999px;overflow:hidden;flex:1}
.progressbar i{display:block;height:100%;background:var(--brand);border-radius:999px;transition:width .3s}
.progressbar.ok i{background:var(--ok)}

/* ---------- drawer ---------- */
.drawer-head{display:flex;align-items:center;gap:10px;padding:12px 16px;border-bottom:1px solid var(--line)}
.drawer-head b{flex:1;font-size:15px}
.tabs{display:flex;gap:2px;padding:8px 10px 0;border-bottom:1px solid var(--line);overflow-x:auto}
.tab{padding:8px 9px;border-radius:9px 9px 0 0;font-size:13px;font-weight:600;color:var(--muted);white-space:nowrap}
.tab.active{color:var(--brand-2);background:var(--brand-soft)}
.drawer-body{flex:1;overflow:auto;padding:14px 16px 30px}
.band-hero{display:flex;align-items:center;gap:16px;padding:14px;border-radius:14px;background:linear-gradient(135deg,#eef2ff,#f3ecff);margin-bottom:12px}
.band-hero .score{font-size:44px;font-weight:800;color:var(--brand-2);line-height:1}
.band-hero .lbl{font-size:12px;color:var(--muted)}
.crit{display:flex;flex-direction:column;gap:8px}
.crit .c{border:1px solid var(--line);border-radius:12px;padding:10px 12px}
.crit .c .h{display:flex;align-items:center;gap:8px;font-weight:700}
.crit .c .h .b{margin-left:auto;font-size:18px;color:var(--brand-2)}
.crit .bar{height:6px;background:#eef1f7;border-radius:999px;margin:6px 0 8px;overflow:hidden}
.crit .bar i{display:block;height:100%;background:linear-gradient(90deg,#8ea6ff,var(--brand))}
.crit .zh{font-size:13px}
.crit .enl{font-size:12px;color:var(--muted);margin-top:4px}
.list-zh{margin:6px 0 0 18px;padding:0;font-size:13px}
.list-zh li{margin-bottom:4px}
.section-h{font-weight:700;margin:16px 0 8px;font-size:14px;display:flex;align-items:center;gap:8px}
.corr{border:1px solid var(--line);border-radius:12px;padding:10px 12px;margin-bottom:8px;font-size:14px}
.corr .o{color:var(--bad);text-decoration:line-through;background:var(--bad-soft);padding:1px 5px;border-radius:5px}
.corr .n{color:var(--ok);background:var(--ok-soft);padding:1px 5px;border-radius:5px;font-weight:600}
.corr .why{font-size:13px;color:var(--muted);margin-top:5px}
.corr .typ{font-size:11px;margin-left:6px}
.upg{display:grid;grid-template-columns:1fr auto 1fr;gap:8px;align-items:center;border:1px solid var(--line);border-radius:12px;padding:9px 12px;margin-bottom:8px;font-size:14px}
.upg .o{background:#f4f6fb;padding:2px 7px;border-radius:6px}
.upg .n{background:var(--ok-soft);color:var(--ok);padding:2px 7px;border-radius:6px;font-weight:600}
.upg .why{grid-column:1/-1;font-size:12px;color:var(--muted)}
.model{white-space:pre-wrap;background:#fbfcff;border:1px solid var(--line);border-radius:12px;padding:14px}
.markup{white-space:pre-wrap;background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px;line-height:1.8}
mark.err{background:var(--bad-soft);color:var(--bad);text-decoration:underline wavy var(--bad);border-radius:3px;padding:0 2px;cursor:help}
mark.fix{background:var(--ok-soft);color:var(--ok);border-radius:3px;padding:0 2px;font-weight:600}
.notice{padding:10px 12px;border-radius:10px;font-size:13px;margin-bottom:10px}
.notice.warn{background:var(--warn-soft);color:#7a4d00}
.notice.info{background:var(--brand-soft);color:var(--brand-2)}
.notice.ok{background:var(--ok-soft);color:var(--ok)}

/* ---------- modal & toast ---------- */
.overlay{position:fixed;inset:0;background:rgba(20,26,40,.45);display:grid;place-items:center;z-index:100;padding:20px}
.modal{background:#fff;border-radius:18px;width:min(720px,100%);max-height:92vh;overflow:auto;padding:22px 24px;box-shadow:0 30px 80px rgba(0,0,0,.3)}
.modal h2{margin:0 0 6px}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.form-grid .full{grid-column:1/-1}
.field label{display:block;font-size:13px;font-weight:600;margin-bottom:4px}
.field .help{font-size:12px;color:var(--muted);margin-top:3px}
.field input,.field select{width:100%;padding:9px 11px;border:1.5px solid var(--line);border-radius:9px;background:#fff}
.field input:focus,.field select:focus{outline:2px solid #b9c6ee}
fieldset{border:1px solid var(--line);border-radius:12px;padding:12px 14px;margin:0 0 12px}
legend{font-weight:700;font-size:14px;padding:0 6px}
.toasts{position:fixed;right:18px;bottom:18px;display:flex;flex-direction:column;gap:8px;z-index:200}
.toast{background:#1c2333;color:#fff;padding:11px 15px;border-radius:12px;box-shadow:0 10px 30px rgba(0,0,0,.25);max-width:380px;font-size:14px;animation:fadein .2s}
.toast.ok{background:var(--ok)} .toast.bad{background:var(--bad)} .toast.warn{background:var(--warn)}
@keyframes fadein{from{opacity:0;transform:translateY(8px)}to{opacity:1}}
.busy-overlay{position:fixed;inset:0;background:rgba(255,255,255,.75);backdrop-filter:blur(2px);display:grid;place-items:center;z-index:90}
.busy-box{background:#fff;border-radius:16px;padding:22px 28px;box-shadow:var(--shadow);text-align:center;max-width:380px}
.busy-box .spinner{width:34px;height:34px;border-width:4px;margin-bottom:10px}
.busy-box .elapsed{color:var(--muted);font-size:13px;margin-top:6px}
.help-bar{background:var(--brand-soft);color:var(--brand-2);border-radius:12px;padding:10px 14px;font-size:13px;display:flex;gap:14px;flex-wrap:wrap;align-items:center}
.help-bar b{font-weight:700}
.shortcut{font-size:12px;color:var(--muted)}
.level-bar{height:8px;background:#eef1f7;border-radius:999px;overflow:hidden;width:100%}
.level-bar i{display:block;height:100%;background:var(--ok);width:0}

/* topic generation */
.gen-item{border:1.5px solid var(--line);border-radius:12px;padding:12px 14px;margin-bottom:10px;display:flex;gap:10px}
.gen-item input[type=checkbox]{margin-top:4px;width:18px;height:18px;flex:none}
.gen-item .body{flex:1;min-width:0}
.gen-item .t{font-weight:700;margin-bottom:4px}
.gen-item ul{margin:4px 0 0 18px;padding:0}
.gen-item details{margin-top:6px;font-size:13px}
.gen-item summary{cursor:pointer;color:var(--brand)}
.user-item{display:flex;align-items:center;gap:8px;padding:6px 8px;border-radius:8px;font-size:13px}
.user-item:hover{background:#f4f6fb}
.user-item .t{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.user-item .del{color:var(--muted);padding:2px 6px;border-radius:6px}
.user-item .del:hover{background:var(--bad-soft);color:var(--bad)}